Doppler effect physics

Learn what the Doppler effect or Doppler shift is in physics. Get a simple definition and get examples and formulas for sound and light.

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The Doppler effect from a moving light source causes a shift in the wavelength of the observed light, a key element of astronomical observations.

F measured in Hertz (Hz). Equation tells perceived frequency. Pitch = frequency. High F = high pitch = ex: female voice. Ultrasonic = above 20,000Hz (human range). Infrasonic = below 20Hz (human range).

The Doppler’s effect is the apparent change in frequency of sound, light or radio waves caused b the relative motion of the source, medium or observer.